3. You measure the weight fraction Cu in an alloy by dissolving 2.012 g of the material in 100.0 mLs of water and measuring the resulting dissolved Cu with atomic emission, obtaining a concentration of 342 mg Cu/L. The SD (standard deviation) of the weight is 0.0002 g, the SD of the volume is 0.15 mLs and the SD of the concentration is 2.2 mg Cu/L. The Cu content is calculated by Weight fraction Cu = (Cu concentration) x (Volume) / (Wt dissolved) a) Calculate the weight fraction of Cu b) Calculate the relative standard deviation of this weight fraction.
3. You measure the weight fraction Cu in an alloy by dissolving 2.012 g of the material in 100.0 mLs of water and measuring the resulting dissolved Cu with atomic emission, obtaining a concentration of 342 mg Cu/L. The SD (standard deviation) of the weight is 0.0002 g, the SD of the volume is 0.15 mLs and the SD of the concentration is 2.2 mg Cu/L. The Cu content is calculated by Weight fraction Cu = (Cu concentration) x (Volume) / (Wt dissolved) a) Calculate the weight fraction of Cu b) Calculate the relative standard deviation of this weight fraction.
Chemistry
10th Edition
ISBN:9781305957404
Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Chapter1: Chemical Foundations
Section: Chapter Questions
Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...
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Transcribed Image Text:3.
You measure the weight fraction Cu in an alloy by dissolving 2.012 g of
the material in 100.0 mLs of water and measuring the resulting dissolved Cu with atomic
emission, obtaining a concentration of 342 mg Cu/L. The SD (standard deviation) of the
weight is 0.0002 g, the SD of the volume is 0.15 mLs and the SD of the concentration is
2.2 mg Cu/L. The Cu content is calculated by
Weight fraction Cu = (Cu concentration) x (Volume) / (Wt dissolved)
a) Calculate the weight fraction of Cu
b) Calculate the relative standard deviation of this weight fraction.
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